This follows from his birth date in 1954 (OP15). We know he was sorted into Slytherin thanks to Draco, who told us so in PS5.
Lucius Malfoy starts at Hogwarts
Date September 1st, 1965
Certainty Inferred from canon
Location in Canon OP15: The Hogwarts High Inquisitor PS5: Diagon Alley
Type of Event Wizarding world
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